waterproof sealant
Worth a lookShows low returns (1.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Returns
Incredible1.0%return rate — above 5% kills the launch gate
Avg price
Great$18.02avg listing price — sweet spot $15–$100
Price range
Great$5.63–$68.97cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good48%top-5 click share — leaders hold, buyers still browse
Conversion
Good5.1%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Market size
Good$321K$321K/yr · 352K searches
Growth
Good+21.0%90-day search growth — must beat 0% to launch
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Review moat
Bad7,872.93avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, waterproof sealant is a $321K/yr Amazon United States market (352K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in Jun–Jul–Sep. Verdict: Worth a look — 60/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
waterproof sealant market data
- Units sold / yr
- 15K–20K
- avg 500–750/product
- Revenue / yr
- $270K–$360K
- units × avg price
- Conversion rate
- 5.1%
- Avg BSR
- #86
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 77%
- Out of stock
- 0.0%
- Avg brand age
- 60 months
- Avg seller age
- 150 days
Competition & brand share
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.Brands
18 falling
Sellers
150
Top-5 brand share
76%
Top 20: 100%
Top-5 click share
48%
Top 20: 89%
Open market
21%
- Tufinein32%
- GORILLA21%
- Flex Seal11%
- GE7%
- J-B Weld4%
- Thompson's4%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +21.0% search growth over the last 90 days.Peak months: Jun, Jul, Sep · busiest ÷ quietest = 3.1×
Top waterproof sealant search terms
- waterproof sealant133K/yr
- water sealant32K/yr
- water proof sealant28K/yr
- leak sealant13K/yr
- clear waterproof sealant20K/yr
- water leak sealant12K/yr
- clear sealant13K/yr
- waterproofing sealant14K/yr
- water seal11K/yr
- clear sealant waterproof21K/yr
Top waterproof sealant products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Transparent Waterproof Coating TUFINEIN 35oz Invisible Waterproof Agent Indoor & Outdoor Sealant Water-Based Clear Sealant Roofs Walls Garden Terraces
Tufinein$24.144.4★2,287 rev
Gorilla 100% Silicone Caulk Waterproof Sealant 2.8oz Squeeze Tube (Pack of 1) Clear -10 Year Mold Resistant Kitchen Window Bath Marine Door and More
GORILLA$8.644.6★4,494 rev
Waterproof Sealant 70oz Clear TUFINEIN Transparent Waterproof Coating Water-Based Invisible Agent Roofs Walls Garden Terraces Indoor & Outdoor
Tufinein$33.054.3★1,606 rev
Waterproof Sealant 17.6oz Clear TUFINEIN Transparent Waterproof Coating Water-Based Invisible Agent Roofs Walls Garden Terraces Indoor & Outdoor
Tufinein$10.014.3★1,606 rev
Gorilla Waterproofing Spray Clear Flexible Rubberized Sealant Coating Paintable UV Resistant Seals Water Air Moisture 14 oz (Pack of 1) for Roofs Gutters Skylights RVs Windows & More
GORILLA$14.184.3★13,292 rev
Newest
by launch date
Transparent Waterproof Sealant 141 Oz Invisible Waterproof Agent Transparent Waterproof Coating for Roof Repair Walls Window Bathroom Kitchen Water-Based Clear Sealant Indoor & Outdoor
LISRUX$38.4452 rev
9900 Sealant Waterproof Silicon Waterproof Sealant Permanent Solution for Roof & Wall Cracks Outdoor Water Proof Exterior Sealants Heat Resistant Tear and Stretch Resistance (White 1Pc)
XIRUJNFD$27.3289 rev
Transparent Waterproof Coating TUFINEIN 10.6oz Invisible Waterproof Agent Indoor & Outdoor Sealant Water-Based Clear Sealant Roofs Walls Garden Terraces
Tufinein$7.27360 rev
Gorilla 100% Silicone Caulk Waterproof Sealant 2.8oz Squeeze Tube (Pack of 1) Clear -10 Year Mold Resistant Kitchen Window Bath Marine Door and More
GORILLA$8.644,494 rev
Waterproof Sealant 17.6oz Clear TUFINEIN Transparent Waterproof Coating Water-Based Invisible Agent Roofs Walls Garden Terraces Indoor & Outdoor
Tufinein$10.011,606 rev
Trending
90-day click momentum9900 Sealant Waterproof Silicon Waterproof Sealant Permanent Solution for Roof & Wall Cracks Outdoor Water Proof Exterior Sealants Heat Resistant Tear and Stretch Resistance (White 1Pc)
XIRUJNFD$27.323.6★
Transparent Waterproof Coating TUFINEIN 10.6oz Invisible Waterproof Agent Indoor & Outdoor Sealant Water-Based Clear Sealant Roofs Walls Garden Terraces
Tufinein$7.274.3★
3M Marine Adhesive Sealant Fast Cure 5200 (06535) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair White 1 fl oz Tube
3M$15.824.6★
Transparent Waterproof Sealant 141 Oz Invisible Waterproof Agent Transparent Waterproof Coating for Roof Repair Walls Window Bathroom Kitchen Water-Based Clear Sealant Indoor & Outdoor
LISRUX$38.444.6★
Gorilla 100% Silicone Caulk Waterproof Sealant 2.8oz Squeeze Tube (Pack of 1) Clear -10 Year Mold Resistant Kitchen Window Bath Marine Door and More
GORILLA$8.644.6★
What buyers say about waterproof sealant
What buyers praise and complain about, mined from review topics.What buyers love
“Good quality and very reliable”
“Easy to Use”
“It works great”
“As advertised”
“Stops leaks”
“Great value”
“Great Adhesive”
“Seriously waterproof”
“Durable product”
“easy to clean up”
What buyers complain about
“Sprayer tank leak”
“Did not work”
“Bad adhesive”
“A bit hard to squeeze”
“Absolute garbage”
“this could be more expensive than you think”
“Not water proof”
“Turns yellow after a while :”
“The tube received is larger than expected, thank you”
“There is a slight odor”
Top return reasons
Common questions
- Is waterproof sealant profitable to sell on Amazon United States?
- The niche generates $321K/yr across 30 tracked products. 4 of 4 products launched in the last 360 days are still selling. 90-day search growth is +21.0%. Flapen's verdict: Worth a look (60/100).
- How competitive is the waterproof sealant niche?
- 18 brands and 150 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in waterproof sealant?
- Top complaints mined from reviews: Leak-Proof, Functionality-Overall, Adhesion/Stickiness. The return rate is 1.0%.
- When does demand for waterproof sealant peak?
- Demand peaks in Jun–Jul–Sep; the busiest month runs 3.1× the quietest.
- What does it cost to enter the waterproof sealant niche?
- Listings span $5.63–$68.97; the average listing price is $18.02 (sweet spot $15–$100). The average incumbent carries 7,873 reviews — the moat a new listing must climb.